Sulforaphane is an isothiocyanate derived from broccoli with therapeutic potential based on its activity to up-regulate genes that influence an aerobic cell's ability to protect against oxidative stress, inflammation, DNA-damaging electrophiles, and radiation.

47) Furthermore, a recent study in cultured liver cancer cells (48) showed that chlorophyllin was one of the most potent inducers of a set of enzymes that protect the cells against potentially harmful oxidants and electrophiles, two types of unstable molecules that damage tissues and contribute to cancer.

Considering that quinone methides are the resonance hybrids between the quinoid and benzenoid structures, and their high reactivity to electrophiles and nucleophiles, it is evident that the polycondensation mechanism in all catalytic conditions can be explained by their participation.

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